Daniel mills



(No Model.)

D. MILLS.

BUTTON HOLE SEWING MAGHINE. No. 298,607. Painented May 13, 1884.

Flai.

JNI/ENT Op/Mm N. PETERS. PhnwLimagmpher. wnhingmn. D. c.

Miren rares rrrnrvr einen.

DANIEL MILLS, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE UNITED STATES AUTOMATIC BUTTONHOLE SEVING- MACHINE COM- PANY, OF NEI/V JERSEY.

BUTTON-HOLE SEWING=-IVIACHINE SPECIFICATION forming part of Letters Patent No. 298,607, dated `lMay 13= 1884.

' Application filed June 14, 1883. (No model.)

T0 all whom t may coli/007%: f

Be it known that I, DANIEL MILLS, a citizen of the United States, and a resident of Philadelphia, Pennsylvania, have invented certain Improvements in Button-Hole Sewing Mechanism, of which the following is a specification.

My present invention consists of an iinprovemeut in the construction of the buttonhole feed mechanism described in an applica tion for Letters Patent filed by me Marchv, 1883, Serial No. 87,153, and in Letters Patent referred to in said application.

In the accompanying drawings, Figure l is a transverse section of the sewing-machine attachment; Fig. 2, a precisely similar view with parts in a slightly different position; Fig. 3, a detached transverse section of the stop-cam devices; and, Fig. 4, a perspective view, partly in section, of the same parts.

My present invention consists in the combination, with the stop-cam T for the primary slide G, of devices for allowing a portion of the cam to yield to a limited extent in case its forward edge should come into contactwith one of the projecting stops. The remaining parts of the mechanism may remain unaltered, and in the drawings I have illustrated precisely` the same parts and used the same letters of reference as in my aforesaid application.

For the purpose of explaining my present invention, it will suffice to note that II is the baseplate of the attachment, on which is guided the transverse primary slide G, with ways G for the secondary slide J. Intermit` tent reciprocating motion is imparted to this slide G from the lever F through the medium of springs j' f acting on astud, g, on the slide. On this slide G are mounted the projections S S', which togetherl form the usual yoke on opposite sides of the shaft O, mounted in bearings on the base-plate H. These projections S S are provided with the usual curved faces, which are acted onl by the adjustable stop-cam T on the shaft O, the latter having an intermittent rotary motion imparted to it by means of a suitable friction-feed I find that in operating the machine at a high speed, the shaft O turning intermittently in the direction of the arrow, Fig. `1, the cam T may strike the edge of the curved face of one of the projections S S and be arrested, as indicated in Fig. l, for a sufficient length of time to break or injure some part of the machine before the movement of the slide G carries the projection S or S out of the line of movement of the cam T. To prevent injury to any part of the machine from this cause I make a change in the construction of and utilize the devices for adjusting the cam T. In my aforesaid application the cam is made in two parts, and is described as being expanded by a radial taper screw against the action of a spring, which tends to bring the two portions of the cam together. In my present improvements, as shown in Figs. 3 and 4, the two segments T T', which carry the two parts of the cam T, are expanded by the action of one or more springs, t t', as the withdrawal of a wedge or taper screw, t, will permit, while the inward adjustment of the taper screw or wedge t will bring the two parts of the cam T toward each other against the action of the springs t t. Thus, should the forward edge of thecam T strike one of the proj ections S S', these springs t t will allow that portion of the cam to turn on the shaft O to an extent limited by the relative position of the otherI part of the cam, as indicated in Fig'. 2, until the return movement of the slide withdraws the projection and allows the forward half of the cam to resume its normal position on the shaft.

I claim as my invention- The combination of a rotating shaft and a slide having projections with a stop-cam carried by said shaft and made in two adjustable sections, a spring or springs interposed to permit the said sections to yield toward each other, and a wedge or taper screw to bring the sections together against the action of the springs, substantially as specified.

In testimony whereof I have signed my name to this specication inthe presence of two subscribing witnesses.

DANL. MILLS.

Vtnesses:

HARRY L. AsI-IENIIELTER, I-LIRRY SMITH. 

